I think commercial ROM loading from the SD card would be a sweet feature!

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Its a pretty possible feature. The ROMs could be coded like the VC or DSiWare apps so that only ones that were bought legally from a Nintendo Download Site would work. The problem with this is that it leaves it really wide open for piracy by just copying the ROMs once they've been bought or exploiting it by using such a system and finding a way to fool the system.